This dialog box is designed for user authorization.
See the image below:
To log on under the specified access account, enter appropriate identification data.
Enter the login in the Login field and the password in the Password field.
There is a panel with standard buttons of dialog box at the bottom of the dialog.
To apply specified identification data, press OK button.
Then the login and the password will be checked. If they correspond to some access account, the dialog box will be closed and you log on under appropriate access account. Otherwise, you will be required to enter identification data once again.
To cancel authorization, press Cancel button or X button in the right part of the dialog caption.